I also have the feeling that this is going round in circles. So let me get back to the core question:

**How do you check if a container is empty?**

IMHO the answer should not depend on the container. While emptiness may mean different things for different types. The check syntax can and should still be uniform.

Not a solution:
0) The current `if not seq` syntax. "check Falsiness instead of emptiness" is a simplification, which is not always possible.

Possible solutions:
1) Always use `if len(seq) == 0`. I think, this would works. But would we want to write that in PEP-8 instead of `if not seq`? To me, this feels a bit too low level.
2) A protocol would formalize that concept by building respective syntax into the language. But I concede that it may be overkill.
3) The simple solution would be to add `is_empty()` methods to all stdlib containers and encourage third party libs to adopt that convention as well. That would give a uniform syntax by convention.

Reflecting the discussion in this thread, I now favor variant 3).

Tim
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